Design Approach to MIMO Diagnostic Observer and its Application to Fault Detection

This paper focuses on the design of diagnostic observer based residual generator (DORG) for fault detection purposes. The property of the existing Multiple- Input-Single-Output (MISO) DORG is firstly discussed, followed by a parity vector based solution. Then, a novel Multiple- Input- Multiple-Output (MIMO) DORG is proposed through rigorous mathematical derivations. Compared with existing approaches, the proposed approach and algorithms retain the correlation information in the output variables, and reduce the offline design complexity and the online implementation efforts. Simulation studies on a numerical example show that the proposed approach has better fault detection performance than the MISO DORG based approach.

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